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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3032b6372d6c9216f3100e19b1d54a7d0b7570509d1451721534da026bb34873' 
  AND token = 'b7Mcpz2bME/MH24aKKFJfgUOt3KTz6M4H2em0JU3V1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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