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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6031320c87e3398eb92b327af5b15ac9af8fec9b3758dc90870e0b156dbf1f0f' 
  AND token = '6EcDb01gZdZDGKW5KzxF/u9ircjNQA03EoXhJx3x/so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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