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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f17ddcae49f671c67cd81ef6cde65a20de0205b33f8fee60b6d39b97cb62e7f' 
  AND token = 'l1Lg0wE41qZJV5NYaaKJ7leLOA0jj5qWGtAfNANVnYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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