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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ecaac2159aba2ebef47cfc55c7a8465ca952772150ee18fc11bdcd1138be9dc' 
  AND token = '2GJyKSSF/4WcDICJk2ptakeBGFT1DQD9GNsh5ryIepo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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