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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57dc7010a6224e01fbe52c72ee9808d199c1a085798bdbc0cfb3bb5b4459e5ee' 
  AND token = 'F9xv/QJRM14XnVVIXehDJItQvku0jTis+GlukHwpehc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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