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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b69b87fda4c5589e0d5cdbe5bdf58827aa0c7878ebea35cf7e68e0ce382ab38' 
  AND token = 'z50e37bxfqMgFKYMKl8RmeI/24XOz3vFX70a90wkfkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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