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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6c174f3d0a0375fc15952ec3220da512f0b912f7b3c50a2f54f130de126d30f' 
  AND token = 'eYLajlRrj6l6+OHCy7mBiEvJHVLQd1jnTLK1gJJ2FK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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