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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6993926acaf8a6780f26ccd3d9b2fd58a2383bd07f1e1c4fd2770ffd85a0cbb5' 
  AND token = 'i4URD+yrab4quRZE5UzOyhUt9puqNZq3qdvAi5rDsM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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