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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '339fd5a55317e97b066abe7dd3e777b35e4dea4a75c0d2515a9a57f0f4f65aa1' 
  AND token = 'F0d+tsPsaOAH/0j4Hdc4v8yrC214f1mkFWEfO+kQPKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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