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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '81eb389554f2f3a229475058a0c1008b717f6f1136559cceafccfcdb26b9f37e' 
  AND token = 'hQKk8nD8Mrn/2bJ0s1I6hEzmCwae9e3qXqAWCgb7Ex8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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