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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3cd241d4daaafb2cdd636059f15d485cac4ddf9c7bbe361b43cfbbb117e7a46d' 
  AND token = 'k04S3QiFddPT/DLG9NqeECV8YAU2M83qlO+/2vdeRi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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