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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd73a24141053e6f89ef3dccc9f4690fb4d4207660574d1b352e824dc7634ee2c' 
  AND token = 'OdCzGuMyZT/AkrJ80e6kLnshmFllXhtr11wo3k0r1bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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