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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '559e89425a7d1f2725c7b0bf32d6a3125a6cccee53ca1d77d5543d3bdca85b89' 
  AND token = 'xMNlrQNrLyKjpEkc4bbgb3XBZwEB3cmI/myULLMGBls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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