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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fbde9b4fe9cca72e9644e3856ec489fd47aa2fbe95eabcfd9e3bf8f4aeba496' 
  AND token = 'fGJD09PIn4fbViNO5NGqqtLLNVpqX3fPhV70QSMrgMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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