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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfab86e06832ebeb8cdc7bf1e156e26ce5d1b76d183c2f994ee2f5c0e72cbf19' 
  AND token = 'TQi4qpUpIR3mfLW0zA5K8rCrUcf6omckU4SjX0eS1bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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