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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '49bc8a6cae88f68aad2bc8e88a95e1122e24e440c3bc514d1f0d05e9f36cceb7' 
  AND token = 'LkBUbTTiKfSJK5/LxUVEsXbjnI5bRUvwSw92h3lF/wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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