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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '255d3f37b1bccd29b4c136aa077c11285d971ffcb8d12088ab1d4b9ef608cbae' 
  AND token = 'xbrB6pAz/UauY2E449G8tMEW9at9Uu3vo9pz7uOatRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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