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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34f0da45cbad244f55fa697b20ddbbe1a2a0319a0e04a3ad1f4076180f30787b' 
  AND token = 'tq7tmLDu3lN0bamhimO+eoS9VsjbUwHR//tLtSmQu3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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