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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8f72f4916688257b0436553e12d6cd5e89bbd9d378893e7a9aba61ab0ceb30a' 
  AND token = 'foPxED/1PBVROtOagkVsUixCUg526w2gqUyqK0b8sck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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