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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d1955206cd70b8611a7e66960e91e6d7d79129e83bdae18a9258a55b44a5842' 
  AND token = 'bVVJRPNr2s3CUmRLKzYS2RMwmt7sZQdwyybv1E/hbjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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