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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be7cd9c02f905cc15941e28f983f5f960314a9195841d821fd3c5b2c408f573f' 
  AND token = 'sXympH/1KM0t0swGxu18XaY8nkN8ck8NrZ6IRtrwHkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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