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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '95606f6ef11ffdebcba6dfdbd6d5184095078404516dfcb4bde6539aad53e64b' 
  AND token = '6gcB42ZS/QfXXlAfF9Eq7Wi0CDqeSvjvuF7Mp/V0GoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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