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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ef761db4a8974c2baee33b69c0d6fb3132231ab4db0d6b9b9a18ed412c77915' 
  AND token = 't8hnXzT1EWeDSlrUEwiCwBLYoGT1HztMf9XNoywx97s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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