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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8cf6a94892773250cb9ff69279284a96dcf05402d16dadca4e3981817a6e5578' 
  AND token = '7jpmGFO9GxySHuxcI5Wthn9WLvAO7xZaxU8kpe9Oxhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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