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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '255fd2700593cba0d78abca3c21e46bef833f521820fd60cd38cef3d99ed82bb' 
  AND token = '7NoLLIOO3d7def9WOkKgy4Vgdz/sIkUsTcn/vCUe0aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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