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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2e588c311a2f40b778d467f6f02dfd4aeb973477739e1923b3d185147b37e4d' 
  AND token = '3Lqiv11zhCsE7woG1EPSdoA2kA8N+EmaWtq4RwjuSOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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