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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7ece9ebe4d64ce86e74a6caac506f647886312ecb3cf974efa38c9260d8fcab' 
  AND token = '7sMfV9UBe+1sFGpik5s4Hs8uZkWXyhkkwelD66nWAao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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