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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5697abdb0395d3b6f5c9a2c8e57fc993865a217a5066c9f1cae2218449a71029' 
  AND token = '0/1naW/WjmHzxqlWs4IsfNZoLiQu6t0jPoOaTuhqXzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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