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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fbddb09441be1c53adb04f40df3b51a7e8ae2c88da80e9ce5343bf59900c807' 
  AND token = '8tZcPiK0KZnT6ckiLUaTL4zTyJoMGu3bJwYHKqpmxb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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