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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f8818f62316ea348d3c3509cb560e47cfe8ffb0f71a1ecd4afbc0bfb9b8ae51' 
  AND token = 'Tro24bb1mSiu12/NaBbJ9inrb0mK7A8pTnYA4BzlMC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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