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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '242fb09085a58a8d8688470e8b3cb1eb7b83f15132c0184025b2cab37469830d' 
  AND token = '5rlXTeRY5o4Oqabg1IIrlniTazMhHAXA2GLrxb4inCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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