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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '282c88c21acddafb55282acbdc1b14ab975e26029640b038c50b0682c2ab045a' 
  AND token = 'AzGZUP/YO95bAethcWxuehtQfFTAyKjPWCx0VlecmOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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