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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a9c24cc98b7da9e5bfb4bd2b9e0b534855a41871ad76cc2be0bc52d8d6eea30' 
  AND token = 'K02CMu6/c4JF8AlU5Fqix6z61Q7CDvY9FyS4L111+Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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