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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbf6a1d7e596bfe98224db7177f6f3b5b3eb0f57a5ba13eccbab05d688f03126' 
  AND token = 'e+HLfWV5sDILuG2BqwEz54fxN8RGDfAtwpzH8UvdEAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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