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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71144cb5e9579b2d98b89432aede477b7ff8a2f60905f348c82ea042f43ccc49' 
  AND token = 'gYWJMRG1Z8ErRpe7OaAiBQjzcoJ8NJKu0AX2zT1hzRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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