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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b3e7064869af8eeb7d2f862ccb7d0a81232c73da80cf483d0046cbd85cea9d1' 
  AND token = 'uonFHcC6SbMTicJSizYn2z7zDXmplsfKngQ4+UD3iok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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