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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5ea575c2f341a47cb0ba08b18a27ff3621a593195ad9316ef17b2f2fce36d3a' 
  AND token = '1RmOobIvshA7Ke42NLr3oK6KcRcdT2F+/9wMrDzcNsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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