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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4ce8bf2388cd713e1470779f2bb90235ba86326250ac1e9f4531cedd69ecd2b' 
  AND token = 'FTy7W0Ed+nzcZ+ggzWK+xnbeHe3C1H5yp8PaKp87It0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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