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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba4cfa7eba9c6a5f9515efb5ef5e5e7c202b784e72d3bb789454066f10ef4c73' 
  AND token = '+6Wd/jtfbijSWixQtK1U1JTXxZA/73ZuPN3QGmdrLLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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