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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97a3dc1ebc6e52d9873a5c76d6b0243a2728700d1978a95c4de39f9cf4e34eb1' 
  AND token = 'f96qFojAdjY11trjQA++TAMcT2/C3QMYcheGT1NOS38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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