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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb641bb6a8d1fb7723e11277441ef0dbf3d3b94730197f98901937ef1e4746a9' 
  AND token = 'p1Bx34Ga9GVxo19//Nf9DsbdNYD4Ubftp7C0JdymCvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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