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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1b1296d5881cf619f1cd5cd6adeaefd5a29e4f2f6817449121edc576653d375' 
  AND token = 'dyznjBvlci2KftlW2H5tcsDZrx+B+tLSIPoREKneKUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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