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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b49a11a1d075db9d2e03fb0c394d421d0360f6a816c8fe1ceca8263dc05a44de' 
  AND token = 'lxSnwc/NJvDmiuib7yV0w+0cT3fQVQcLttCjZ7uABXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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