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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3076285ca9d5c31bdeb1e0a347c4b8e2981ee77831c7999ce36b1e4ad86a216a' 
  AND token = '1ssyz/JKc4EAIgt7SMbQiFwGtdpGinkVjnCx4CmiVsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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