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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '914f8d1b0bb1068cfed642fab7cfc894e4c6cce28b2fec37ec89d9957ebf0133' 
  AND token = '3LSuZ2CTW/dxk5m0npj4YXBQu3pP3HuLTZkkMR3TrPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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