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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e0760938a4ead463f44c83dd6711216d4e8c21cb57ad7c9460a02eb1a175e55' 
  AND token = 'VTmpQL0u0J96fktf5ROMotUgUuZmYhqz4qnuo6qDeJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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