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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '242a0f3a95fc91b9db2b89afd586b5d8969db6cf10afc1f0a103af7f21dd9939' 
  AND token = 'RjgQpoPVanhmVE6whB/BC9PIDowFNbaOAmnRCZ6cAz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}