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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '177acc3c4d07c042048aada3dce8eebe2ed92bb9718aacac714ef31d27793d9c' 
  AND token = 'Mdth0/y/r6MquLBfSNrjKoMCcyNePIOKxv7wmJxORx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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