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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '21bf4d50f7f41ab460f9805bb058fbcfcf3f08e210a6a0b205638a4b1e17183f' 
  AND token = 'OraTg1MJyVxJ7D/BwflBby0bvTRmmN4w4szQrhmb3lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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