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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f321ee986c8debde12355480e75390e6a41058923fcf6774db1600b4696a8b2' 
  AND token = 'wyl/x7Ob1TFCNEMotqLGJAorvsA6idA8ufW3KL7vd/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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