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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '062e3ba5a33c0768f54d13c89ef05e25bfa558292e277bf8e8aecac710bc0558' 
  AND token = '4c4MamPkThStjx8YGXxVp6dQtU/lZJk3yFjOkxjoFHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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