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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a478b9a582865654a2081af4caefededec014c211efc7b479469e9b5c04c5b48' 
  AND token = 'p/nm+E+H1aivsk+CDm3BdAEutUpB831gFCECyvZwTnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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