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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9304159b16836807a5a0bc8bd426025566a73c95cb34b97a54ce492ad46fc26' 
  AND token = '5l4NBBcFTeiQKogrS0t8cC37rb0gwY+ZYita6IkKWEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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