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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da46d10efe94aef6bab105fcafb32f02a44d6ce685203eb7c83c0f61cffee99b' 
  AND token = 'g2u+yQOovaVkEXltds5Pg5XHnlfO03nSh6eMhampFeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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