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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41c5a780a68dc2425b9ef4b8c69d103c3089f95def1fe8ed63ce5d6fe01dd3f8' 
  AND token = 'XNqniXa5I5T0scsaWyiDj5T7nrY+pgpmnbKHoejm710=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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