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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e403f1e8288dda6ba601be47c7d7b36459963a53797cd0287a456d87b2cb8d9e' 
  AND token = 'IFsBNUAkENfJYQj1gjSTfUSGRIGe2sYAmHaOX92rTcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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