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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11ae4b5d6a2ea5cdeebb296da139f9e16d974107f4651a7c99f5442960249a5e' 
  AND token = 'c5KVcFbJKLvK7nag23q1xzbV/HKqrX6tKHxMUTfdLxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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