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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e970e06f4b6e269a46d7a822c7182471d11699f341e11d3953e6b82ca42b866a' 
  AND token = 'Jioe0fFUegJxnFUn/jGkxX8/aKXU6tAuBgahjI7kMOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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