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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcbc3ad6517d46977ab4624ae69e2d2906fee506e81666646b0eb4aaec0ab938' 
  AND token = '37A3iFdqoAPzQKWZg7rN+f+Bsad0CduAYoJ7b5RmloY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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