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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4cf03db15c0f8aecc079660f322f50f736591a6dcdf780e0bd0070ce4795502' 
  AND token = 'xDp4G9EU01uiRfZv5ywnr3BbJF84FGWDSUOAQOgElMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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