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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd77421b0bc2a30b9668bb66250261d656d9d4176f543c89149c736575cd4266' 
  AND token = 'FTnJ1qWkthHz7ENhfDj25ziLSDAh9JR/PXW+MTrE0D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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