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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4447ba9bfca80875a2db08d53163c43ab62ee22ff194da1e0e8b891b4c838ead' 
  AND token = '1+R8vZmvy0FgZ5pLKNdt9VxrO+dzoJUnLVcme0lgQIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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