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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f47454a473f4f7411d126d363174a00404772b835a48a579dea8a580593b3592' 
  AND token = '9izeh1BEewTZxcPrGkZUld4woitAIA6yilkf99ri7pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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