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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bfce5f38d5b025a1e7bf2b63ec8b3b095e5be78fffcb3895540d411660590315' 
  AND token = '3LiOL2jnQGl0xn2yO7v8S+ACSz0coDUVTwyqWAsrTko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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