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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6d97e7e3be8e3ecf88ea2b76767b50b493eeae5c3553fcec5b4945e34e50206' 
  AND token = 'qH8NHT4Mm7eMR3JJLaWbz24g4jbo1G9fHseyvmFThV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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