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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'acc43eecdedaff577d9b8a111484a19e6ed3a342d6f80c56fe6b95da6babef9b' 
  AND token = 'GkqxaEuAvci1prsuzczYw8FieJqiY+yqIT2McyU6E7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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