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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '944b5cbb1c1d07b960b2d78b8d6979e67da8de5095d83910c436d8a704b6fb70' 
  AND token = 'bnlfwQd834rvvqdCBCHD6e+7CbsJbXee4uQ5onvk1xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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