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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66fa7f9695786309b231bf8d7333eae99bf3ad4bff74ad5afc3162ac4f8a8c35' 
  AND token = 'P02LtTBY7vnh7Hy+5SWk189CustKj/hpDdD7XWM7skM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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