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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46fbdad8a082d8cdf77258864644a011fb6a497db1a86d8b42e72a9a1fb5e8fe' 
  AND token = 'L8SX2ZM6Db+TYzAvIzMy51k9te2dKlPxrmgWJuALt4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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