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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47b6ef03368ae8ed8342aca624e13ec52e1b278c71ec3fa043cd9e2216e3ac89' 
  AND token = 'U2gwb7I6lYzoLsaqlTJYlblR8a1RfMtXJT20XmPnUmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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